In the 1970's, District officials were becoming aware of potential problems with private wastewater disposal systems ( septic tanks ) in the vicinity and potential impacts on the local groundwater supply. With federal funds available through the Clean Water Act, the District created two sewer assessment districts in 1979 and sold bonds for the construction of 64 miles of mainline sewer and 27 miles of house-connection laterals. Approximately 75% of the $35 million cost was satisfied with federal grant money and the remainder through direct assessment of local property owners. The project also included the purchase of treatment plant capacity from the City of Glendale and the construction of 7 miles of large-diameter sewer interceptor through the City. All sewer system construction was completed in the mid-1980's. The District is located in the Crescenta Valley area of Los Angeles County in the foothills of the San Gabriel Mountains, between the San Fernando and San Gabriel valleys. The District provides water distribution and sewage collection within its boundaries to the unincorporated communities of La Crescenta, Montrose, and Verdugo City as well as a small portion of the City of La Canada-Flintridge. The District also serves a portion of the City of Glendale in Montrose and La Crescenta outside District boundaries. The District serves an area of approximately 4 square miles in relatively steep terrain ranging from 1200 feet to almost 3000 feet above sea level. The customer base is primarily residential with some light commercial along Foothill Boulevard in La Crescenta and Honolulu Avenue in Montrose. The District currently provides water to over 8000 accounts representing a population of approximately 32, 000. Customer growth is steady although the Crescenta Valley area is nearly built-out. Residential growth is occurring through increased housing density in the multiple-unit zoned areas ( primarily Montrose ) as well as limited in-fill housing development on random parcels in La Crescenta.